how to know whether compound is paramagnetic or diamagnetic if the compound is formed of more than 2 atoms like H20, co2,No2 , So2 ,NH4 etc tell me the rule

If a molecule has odd number of valence electrons, it is paramagnetic whereas molecules having even number of valence electrons are diamagnetic. Example:
Molecule  Number of valence electrons
H2O  2 + 6 = 8  It is diamagnetic
CO2  4 + 12= 16  It is diamagnetic
NO2  5 + 12 = 27   It is paramagnetic
SO2  6 + 12 =18  It is diamagnetic
 

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